It doesn’t sound like they’ve “solved” it. Just that they have a work-around that means that bit by bit their sealed datacenter pod becomes more and more broken. And if their solution for that is to build in redundancy so that even when it’s say 30% broken it operates at 100%, that means they have to ship up something like twice as much hardware as a standard datacenter with most of it being redundant in case something fails. That extra expense may not be too bad if it’s a pod under the ocean, but if you have to pay $5000/kg to put it in orbit, that’s a huge additional expense.